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Clinic Type

Family Medicine

Address

1855 S Koeller St, Oshkosh, WI 54902

Phone

(920) 223-7010

Email

careers@ascension.org

Opening Hours

Not published — contact the clinic to confirm hours.

Emergency Care

If you are experiencing a life-threatening emergency, call 911 or go directly to the ER.

Services Offered

Team

  • Katherine Hartstern, MD — Physician
  • Rebecca L Ott, APNP — Advanced Practice Nurse Practitioner
  • Andrea L Verhagen, APNP — Advanced Practice Nurse Practitioner

Insurance & Payment

Languages Spoken

FAQs

I am looking for a Family Medicine clinic. What are the opening hours?

The page indicates 'Accepting new patients' and lists multiple entries but does not specify exact hours for the Koeller Street Family Medicine location.

What is the full street address for the Family Medicine clinic on Koeller Street?

1855 S Koeller St, Oshkosh, WI 54902.

What is the contact phone number for the Koeller Street Family Medicine clinic?

(920) 223-7010.

Photos

What Patients Say

Overall sentiment across review platforms: mixed

  • Birdeye (Ascension Medical Group Deerwood Ave): 4.3/5 (68)
  • Birdeye (Ascension Medical Group Main St): 4.5/5 (408)
  • Ascension internal provider ratings: Varies by individual provider, generally 4.7-5.0/5 (Varies by provider)
  • WebMD (Individual Provider): 4.0/5 (7)

Patients praise

  • Generally high star ratings (often 4.7-5.0 on internal platforms)
  • Courteous front-desk and nursing staff reported in many reviews
  • Providers praised for being welcoming and thorough
  • High availability for scheduling appointments reported by some patients

Common complaints

  • Billing and insurance claim disputes
  • Long wait times for appointments and at facilities
  • Poor bedside manner or communication from some providers
  • Concerns regarding staff professionalism and responsiveness

"Whenever you call to make an appointment they are always available. There service is really good and the people there are so nice and welcoming."

Birdeye User Review

"The billing discrepancy caused Dan and Helen Lococo over six months of emails, calls and sleepless nights while the couple pushed for answers from Ascension."

Journal Sentinel/Public Investigator

"Awful. Unprofessional. Doesn’t explore all options and isn’t friendly."

WebMD User Review

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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